3208

Dr. Chip

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An excellent question. Here is the info that was listed with the Stillman 35..
"Driven by the reliable Caterpillar 3208T engine, Rain Dog is very efficient: at 8knots/1200rpm she gets 3.5mpg, at 12knots/2400rpm she gets 1.71mpg and gets an additional knot of speed for every 200rpm"
I suspect one could do a linear regression to estimate fuel usage at 2K, making assumptions for boat size and weight. I am more certain that someone will know better from both published literature and personal experience.
 

Tuna Pursuit

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If your not in hurry @ 8.5K that is super efficient. My question is actually for another boat I am looking at. I think under load the consumption is apx the same if the boat is geared & propped correctly. Someone on here will know.

Thanx
 

captainlarry84

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The key with the 3208 is that it MUST achieve 2800 RPMs at WOT. Any less and she is doomed for a blow-up. At 2400 RPMs a 3208 CAT makes about 220 HP & burns about 12-12 GPH. The last 400 RPMs the HP goes way up quickly along with the fuel burn. That is the one knock on all turbo CATS you really cannot use the HP, as they recommend the continuous RPMs at 2400 & no more. In fact a 3208 210 Natural you can run all day long at 2800 RPMs because the HP is so low.
 

Kodiakan

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3208 T vs NA

The key with the 3208 is that it MUST achieve 2800 RPMs at WOT. Any less and she is doomed for a blow-up. At 2400 RPMs a 3208 CAT makes about 220 HP & burns about 12-12 GPH. The last 400 RPMs the HP goes way up quickly along with the fuel burn. That is the one knock on all turbo CATS you really cannot use the HP, as they recommend the continuous RPMs at 2400 & no more. In fact a 3208 210 Natural you can run all day long at 2800 RPMs because the HP is so low.

Many of the older DE's I'm looking at have the 3208 either turbo or NA. So reading your post I'm wondering, on a continuous RPM basis, does the T have much more HP than the NA? It looks like only 10 or so HP differance (on continuous). I suspect the turbod has other advantages like getting on step etc.....Thanks for the lessons.
 

Tuna Pursuit

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Many of the older DE's I'm looking at have the 3208 either turbo or NA. So reading your post I'm wondering, on a continuous RPM basis, does the T have much more HP than the NA? It looks like only 10 or so HP differance (on continuous). I suspect the turbod has other advantages like getting on step etc.....Thanks for the lessons.

I beleive the natural is 215 & the T is 375.
 

Tuna Pursuit

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Capt Larry, I'm looking at a boat that says it has a 3208T @ 350. I assume they just don't know it is a 375. What I found was the 375 @ 2000 is burning 6.5 gal hr. Are my assumptions correct my friend?
 

manni-yunk

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3208N is 220 hp......3208 T 320 hp.......3208 TA 355 and 375

3208T can be 275, 300, 320

3208 TA can be 350, 375, 435 , or 450


Most people say that at 320HP and below - you can run them forever at WOT and still not hurt them.

Once you add the Aftercooler, and take the HP at or above 350 - you now have to watch the loaded RPM and cruise in order to get long life.

At 435, or 450 - they are a little suspect unless babied.


As to burn - at 275 HP - I burn about 10 -10.5 gallons per engine per hour at 2400 RPM.

At 320 HP - the burn goes up to about 11.5 - 12 g/h at 2400 RPM (if propped correctly).


Mt 3208's have 30 years on them.....and still running strong!
 
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jerseysportfisher

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Rich,

@ 2100 i burn 7-8gph a side with canyon load

I'm propped to turn 2850 filled with fuel a 3 guys.

Albiet my hull is quite abit different from a DE
 

MASTERENEGADE

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At 2000 RPM my 3208t(320hp) burns approx 8g/hr 2200rpm im closer to 9-9 1/2gph, I never cruise any higher then 2200rpm, the engine sounds real happy and purrs right along. Giving me 12-14knts honest cruise wot my boat will flirt with 20knts.

12-14knts is plenty for me since i do not make canyon runs with her. Local chartering I am super pleased w the efficiency and low maintnence of this engine. I would but another boat with these engines anyday :)
 

captainlarry84

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Many of the older DE's I'm looking at have the 3208 either turbo or NA. So reading your post I'm wondering, on a continuous RPM basis, does the T have much more HP than the NA? It looks like only 10 or so HP differance (on continuous). I suspect the turbod has other advantages like getting on step etc.....Thanks for the lessons.

No it does not a 3208 210 @ 2800 will perform about the same at a 3208 320 @ 2400 RPMs. The natural can run all day long at 2800. Just make sure that the boat can turn all of the RPMs. A natural @ WOT only turning 2700 is doomed for failure. The governor will keep pouring fuel to get to 2800 RPMs which cannot happen due to load. The by product is high combustion head temperatures which can only be read with a pyrometer. You temp gauge will read fine by that is only 1/2 the story. At 210 natural will run a 950 degrees pyrometer temps & and a 320 @ 2400 will also read 950 Pyrometer temps. Bump the 320 up to 2800 RPMs and the pyrometer goes to about 1050 which is to hot for continuous running.
Out of all the older diesels the 3208 320 HP & even the 375 are my favorites. In buying a used boat with either of the these motors I consider it a plus. Not to mention on a repower if the 3208 fits most other new motors will glove in easily plus you lose 1000 lbs. on most new motors.
 

Kodiakan

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No it does not a 3208 210 @ 2800 will perform about the same at a 3208 320 @ 2400 RPMs. The natural can run all day long at 2800. Just make sure that the boat can turn all of the RPMs. A natural @ WOT only turning 2700 is doomed for failure. The governor will keep pouring fuel to get to 2800 RPMs which cannot happen due to load. The by product is high combustion head temperatures which can only be read with a pyrometer. You temp gauge will read fine by that is only 1/2 the story. At 210 natural will run a 950 degrees pyrometer temps & and a 320 @ 2400 will also read 950 Pyrometer temps. Bump the 320 up to 2800 RPMs and the pyrometer goes to about 1050 which is to hot for continuous running.
Out of all the older diesels the 3208 320 HP & even the 375 are my favorites. In buying a used boat with either of the these motors I consider it a plus. Not to mention on a repower if the 3208 fits most other new motors will glove in easily plus you lose 1000 lbs. on most new motors.

Thanks Cap, I just about got it figured out. Appreciate the input from all......
 
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